201145931 «/ / «Z-Γ厶 μ*· 六、發明說明： 【發明所屬之技術領域】· 本發明是有關於一種使用多個無線通道進行無線通 訊的無線通訊系統。 【先前技術】 近年來，例如使用特定小電力無線電台等的無線電 台’進行用以使設置於遠程地點的裝置的功能得以啟動、 變更、或結束的控制訊號的授受、或設置於遠程地點的測 定機的測定結果的授受的無線通訊系統正在普及。此種無 線通訊系統適應於照明控制系統、防犯系統、對講門鈴系 統（doorphone system)、火災報警系統、自動遠程檢查系 統等多種多樣的系統，例如有專利文獻1中所記載的火災 報警系統。 專利文獻1中所記載的火災報警系統中，將多台火災 感知器（無線機）設置於多個部位，且各火災感知器皆設 置有無線的通訊功能。該火災報警系統是在任一火災感知 器感知火災後’使該火災感知器自身的警報鳴響，並且向 其他火災感知器連續發送包含火災感知資訊在内的無線訊 號。又，接收到來自已感知火災的火災感知器的無線訊號 的其他火災感知器會根據該無線訊號中包含的火災感知資 訊而使警報鳴響。 此處，上述火災感知器發送、接收的無線訊號是由同 步位元（前文（preamble))、框(frame)同步圖案（獨特字 喝（unique word))、目的地位址、發送源位址、訊息、以 ⑧ 201145931 及錯誤檢測碼而構成。所謂前文，是指例如將0與1交替 連續排列而成的位元同步用的位元圖案，位元長度設定為 8位元组(byte)左右。又，所謂獨特字碼，是指與前文不同 的位元圖案的位元列’其使用難以包含於訊息等中的位元 圖案。由接收侧的火災感知器檢測出該前文及獨特字碼， 藉此可判斷已接收到的無線訊號是自身系統内所利用的無 線訊號’且可接收繼獨特字碼後的目的地位址或訊息等而 取得必要的資訊。又，錯誤檢測碼包含例如Crc (Cyclic Redundancy Check，循環冗餘檢查碼）等，可確認已接收 到的無線訊號的整合性，並檢測出由於某些原因而產生位 元反轉等的異常。 於上述無線通訊系統中，為了於多台無線電台（發送 器、接收器）間進行無線訊號的授受，而考慮於無線訊號 使用的特定的頻帶内設置多個無線通道。於該情況下，各 發送器對無線通道進行擇一選擇而發送無線訊號 ，接收器 以規定的時間職藉由例如時間分割而對所有無線通道進 仃掃描。而且，接收器根據接收訊號強度指示訊號 (Recmed Signal Strength Indicati〇n : RSSI)而測定各無 線通道中的訊魏度，若所败的訊號強度纽規定的臨 限值二則物歧的檢測，並進行鱗訊號的接收 。如此， 。收益可触^各發送II任意的無線通道巾的無線訊 #無線電台間進行無線訊號的授受。 [專利文獻1]日本專利特開雇94773^號公報 然而’當發送器選擇特定的無線通道而發送無線訊號 201145931 ,^-Γ^ιχ 時，於並非發送無線訊號的無線通道的其他無線通道中會 有無線ail號的功率戌漏的情況。此處，若將接收器與發送 器的距離设置為近距離，則其他無線通道中的訊號強度有 時會超過規定的臨限值，從而有可能導致接收器將接收對 象的無線通道©^為其他無線通道並㈣輯無線訊號的 接收。因此，發送器發送無線訊號的無線通道的無線訊號 有被忽略之虞。 另一方面，對此種無線傳送系統而言，亦可於多個系 統中共用接收器側的無線電台，例如可應用於以下系統： -台接收器接收來自對講門鈐系統的人體檢_測器的檢 測訊號，並且接收對照明控制系統的調光位準進行操作的 調光訊號後，對照明器具的調光位準進行操作。再者，於 對講門鈴系統及照明控制系統中，可分別連接多個發送器。 然而，於先前的無線傳送系統中，為了進行位元同步 而前文的位元長度被設定為必要的最小限度的位元長度 (於上述火災報警系統中為8位元）。因此，若發送無線ς 號的發送器增加，則於某發送器中發送無線訊號時，導致 接收器侧對其他無線通道進行掃描的概率變高，從而接收 器側忽略無線訊號的前文的可能性提高。於該情況下，發 送器側再次連續發送相同的無線訊號，但當所發送的訊息 的資料長度較長時，自前文被忽略起直至再次發送為止時 的必要的時間會㈣㈣長，其結果，將產生無線訊號的 發送及接收所需的時間變長的問題。 【發明内容】 6 ⑤ 201145931 本發明是有馨於上述情況而提供一種無線通 統，其即使於將發送器與接收器近距離地設置的情 ’、 可降低接收器忽略無線訊號的可能性。 月/下亦 又 ，本發明提供一種使發送器所發送的無線訊號 文被忽略的可能性降低、並可於較短時間進行無 引 收發的無線通訊系統。 …·’就的 根據本發明的第1態樣，提供一種無線通訊系統々 括：發送器，其對頻率彼此不同的多個無線通道進行擇t 選擇而發送無線訊號；以及接收器，其接收由上述發送= 發送的無線訊號；上述接收器包括：訊號強度檢測部，其 對以母一規定的掃描週期依序被切換的掃描對象的每一無 線通道的訊號強度進行測定；記憶部，其用來記憶藉由^ 述訊號強度檢測部所測定的每一無線通道的訊號強度；以 及訊號接收部，其使上述掃描對象的無線通道中的記憶於 上述記憶部中的訊號強度較大的無線通道優先進行無線訊 號的接收。 根據上述構成，於訊號強度最大的無線通道中進行無 線訊號的檢測，故而相較於無線訊號的功率有洩漏的無線 通道，使與接收器接近配置的發送器所發送的無線通道更 優先進行無線訊號的接收。藉此，即使於將發送器與接收 器近距離地設置的情況下，亦可降低接收器忽略無線訊號 的可能性。 又’上述無線訊號包含表示發送目的地的接收器的發 送目的地位址，上述接收器對無線通道進行切換，直至自 7 201145931 上述掃描對象的無線通道中的、記憶於上述記憶部中的訊 號強度較大的無線通道開始依序接收到的無線訊號的上述 發送目的地位址中包含目的地自身作為發送目的地為止， 並接收該無線通道的無線訊號。 根據本發明的第2態樣，提供一種無線通訊系統，包 括：一個或多個發送器，其對頻率彼此不同的多個無線通 道進行擇一選擇而發送無線訊號；以及接收器，其接收由 上述發送器發送的無線訊號；上述無線訊號具有；將規定 的位元同步圖案反覆排列而成的前文、以及包含發送器識 別用位址及發送資訊在内的資料，上述接收器包括：同步 位;^檢測部，其以每一規定的掃描週期，藉由時間分割而 對掃描對象的無線通道依序進行切換並掃描，針對每一無 線通道而檢測上述位元同步圖案；以及資料接收部，其ς 檢測出上述位元同步圖案後，接收繼前文後的上述資料 上述前文至少具有將相當於上述掃描週期的i個週期量的 時間的位元長度、與上述位元同步圖案的檢測所需要的位 元長度相加後的位元長度。 據此，由於接收器檢測出由發送器發送的無線訊 位元同步圖案的可能性提高，故而可降低發送器所發送的 無線訊號的前文被忽略的可能性，可於較短時間進行 訊號的收發。 ，又，上述接收器亦可包括設定上述掃描對象的多個無 線通道的通道設定機構’上述發送器可根據由上述通道讯 定機構所設定的無線通道的通道數量而使前文的長度= ⑧ 8 201145931 i/342pif 化。 。。根據該構成’由於可使發送財的前文長度根據由接 收器δ又疋的無線通道的掃描數量而增減，故而可選擇更佳 的前文長度’可降低由發送輯發送的無線訊號的前文被 忽略的可驗，進而可於較短時，行無線訊號的收發。 又，上述接收器亦可包括對上述掃描對象的每一無線 通道設錢先度的優先度設定部，±述同鈴元檢測部可 根據每一無線通道的上述優先度而設定上述掃描週期中的 無線通道的掃描次數。 據此，例如於1次掃描週期中’會多次檢測優先度較 =的無線通道中的無線訊號，故而來自優先度較高的發送 器的無線訊號被檢測的可能性進一步提高。 又，上述接收器亦可包括對上述掃描對象的每一無線 通道設定優先度的優先度設定部，上朗步位元檢測部可 根據每—祕通道的上述優紐，吨定上雜描週期中 的無線通道的掃描時間。201145931 «/ / «Z-Γ厶 μ*· VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a wireless communication system for wireless communication using a plurality of wireless channels. [Prior Art] In recent years, for example, a radio station that uses a specific small power radio station or the like performs a control signal for enabling, changing, or terminating a function of a device installed at a remote place, or is installed at a remote place. A wireless communication system for transmitting and receiving measurement results of a measuring machine is spreading. Such a wireless communication system is suitable for a variety of systems such as a lighting control system, an intrusion prevention system, a doorphone system, a fire alarm system, and an automatic remote inspection system. For example, there is a fire alarm system described in Patent Document 1. In the fire alarm system described in Patent Document 1, a plurality of fire sensors (wireless devices) are installed in a plurality of locations, and each fire sensor is provided with a wireless communication function. The fire alarm system causes an alarm of the fire sensor itself to sound after any fire sensor senses a fire, and continuously transmits a wireless signal including fire perception information to other fire sensors. In addition, other fire sensors that receive a wireless signal from a fire sensor that has sensed the fire will sound an alarm based on the fire perception information contained in the wireless signal. Here, the wireless signal transmitted and received by the fire sensor is composed of a synchronization bit (preamble), a frame synchronization pattern (unique word), a destination address, a source address, and a source address. The message is composed of 8 201145931 and error detection code. The former is a bit pattern for bit synchronization in which 0 and 1 are alternately arranged in succession, and the bit length is set to about 8 bytes. Further, the unique word code refers to a bit line column of a bit pattern different from the above, which uses a bit pattern which is difficult to be included in a message or the like. The preamble and the unique character code are detected by the fire sensor on the receiving side, so that the received wireless signal is determined to be a wireless signal used in the system, and the destination address or message after the unique word code can be received. Get the necessary information. Further, the error detection code includes, for example, a Crc (Cyclic Redundancy Check), and the like, and the integrity of the received wireless signal can be confirmed, and an abnormality such as bit inversion due to some reason can be detected. In the above wireless communication system, in order to transmit and receive wireless signals between a plurality of radio stations (transmitters and receivers), a plurality of wireless channels are set in a specific frequency band in consideration of the use of the wireless signals. In this case, each transmitter selectively selects a wireless channel to transmit a wireless signal, and the receiver scans all wireless channels for a predetermined time by, for example, time division. Moreover, the receiver determines the degree of the Wei in the wireless channel according to the received signal strength indication signal (Reced Signal Strength Indicati〇n: RSSI), and if the defeated signal strength is defined by the threshold value, the detection of the object difference is And receive the scaly signal. in this way, . The revenue can be touched by the wireless communication of any wireless channel that is sent by any of the two # wireless stations. [Patent Document 1] Japanese Patent Laid-Open No. 94973^ However, 'When the transmitter selects a specific wireless channel and transmits the wireless signal 201145931, ^-Γ^ιχ, in other wireless channels that are not wireless channels that transmit wireless signals There will be a power leakage of the wireless ail number. Here, if the distance between the receiver and the transmitter is set to a close distance, the signal strength in other wireless channels sometimes exceeds a prescribed threshold, which may cause the receiver to receive the wireless channel of the object. Other wireless channels and (4) the reception of wireless signals. Therefore, the wireless signal of the wireless channel that the transmitter sends the wireless signal is ignored. On the other hand, for such a wireless transmission system, a receiver-side radio station can be shared among a plurality of systems, for example, the following systems can be applied to: - The receiver receives a human examination from the intercom threshold system _ After the detector detects the signal and receives the dimming signal that operates the dimming level of the lighting control system, the dimming level of the lighting device is operated. Furthermore, in the intercom doorbell system and the lighting control system, a plurality of transmitters can be connected separately. However, in the prior wireless transmission system, the bit length of the foregoing is set to the minimum necessary bit length (8 bits in the above fire alarm system) for bit synchronization. Therefore, if the transmitter transmitting the wireless signal increases, the probability that the receiver side scans the other wireless channels becomes higher when the wireless signal is transmitted in a certain transmitter, so that the receiver side ignores the possibility of the wireless signal. improve. In this case, the transmitter side continuously transmits the same wireless signal again, but when the data length of the transmitted message is long, the necessary time from the previous text to the time of resending until the second transmission is (4) (four) is long, and the result is The problem that the time required for transmission and reception of the wireless signal will become long becomes long. SUMMARY OF THE INVENTION 6 5 201145931 The present invention provides a wireless system in which the above-described situation provides a wireless system that reduces the possibility of the receiver ignoring the wireless signal even if the transmitter is placed at a close distance from the receiver. Further, the present invention provides a wireless communication system which reduces the possibility that the wireless signal transmitted by the transmitter is ignored and can be transmitted and received in a short time. According to a first aspect of the present invention, a wireless communication system includes: a transmitter that selectively selects a plurality of wireless channels having different frequencies from each other to transmit a wireless signal; and a receiver that receives the wireless signal; a wireless signal transmitted by the above-mentioned transmission; the receiver includes: a signal strength detecting unit that measures a signal intensity of each wireless channel of the scanning target sequentially switched by a predetermined scanning period; and a memory unit The signal strength of each wireless channel measured by the signal strength detecting unit is stored; and the signal receiving unit causes the wireless signal in the wireless channel of the scanning target to have a greater signal strength stored in the memory unit. The channel preferentially receives the wireless signal. According to the above configuration, the wireless signal is detected in the wireless channel with the strongest signal strength, so that the wireless channel transmitted by the transmitter close to the receiver is given priority over the wireless channel with the power of the wireless signal being leaked. The reception of the signal. Thereby, even in the case where the transmitter and the receiver are set up close to each other, the possibility that the receiver ignores the wireless signal can be reduced. Further, the wireless signal includes a transmission destination address indicating a destination of the receiver, and the receiver switches the wireless channel until the signal strength stored in the memory unit in the wireless channel of the scanning target from 7 201145931 The destination address of the wireless signal that the larger wireless channel starts to receive sequentially includes the destination itself as the transmission destination, and receives the wireless signal of the wireless channel. According to a second aspect of the present invention, there is provided a wireless communication system comprising: one or more transmitters for selectively selecting a plurality of wireless channels having different frequencies to transmit a wireless signal; and a receiver receiving the The wireless signal sent by the transmitter; the wireless signal has a preamble in which a predetermined bit synchronization pattern is repeatedly arranged, and a data including a transmitter identification address and a transmission information, and the receiver includes: a synchronization bit And a detecting unit that sequentially switches and scans the wireless channel of the scanning object by time division for each predetermined scanning period, detects the bit synchronization pattern for each wireless channel, and the data receiving unit, Thereafter, after detecting the bit synchronization pattern, receiving the above-mentioned data, the foregoing has at least a bit length corresponding to i cycles of the scanning period, and is required for detecting the bit synchronization pattern. The length of the bit after the bit length is added. Accordingly, since the possibility that the receiver detects the wireless bit synchronization pattern transmitted by the transmitter is improved, the possibility that the wireless signal transmitted by the transmitter is ignored can be reduced, and the signal can be performed in a shorter time. Send and receive. Furthermore, the receiver may further include a channel setting mechanism for setting a plurality of wireless channels of the scanning target. The transmitter may lengthen the length of the wireless channel according to the number of channels of the wireless channel set by the channel determining mechanism. 201145931 i/342pif. . . According to this configuration, since the length of the preamble for transmitting the money can be increased or decreased according to the number of scanning of the wireless channel by the receiver δ, the preferred preamble length can be selected to reduce the preamble of the wireless signal transmitted by the transmission. Ignore the test, and then the wireless signal can be sent and received in a short time. Moreover, the receiver may further include a priority setting unit for setting a money advance for each wireless channel of the scanning target, and the same ringing unit detecting unit may set the scanning period according to the priority of each wireless channel. The number of scans of the wireless channel. Accordingly, for example, the wireless signal in the wireless channel having the priority = is detected multiple times in one scanning cycle, and thus the possibility that the wireless signal from the higher priority transmitter is detected is further improved. Moreover, the receiver may further include a priority setting unit that sets a priority for each wireless channel of the scanning target, and the upper step bit detecting unit may set a miscellaneous drawing period according to the above-mentioned optimal button of each secret channel. The scan time of the wireless channel.
據此，例如於1次掃描週期中，檢测優先度較高的無 線通道，的無線訊號的期間會變長，故而來自優先度較言、 的發送器的無線訊號被檢測的可能性進一步提高。 W -上述無線訊號中，包含與上述位元同步圖案不同 兀圖案的框同步圖案是繼上述位元同步圖紐而排列著， 上述接收H包括：訊賴度檢測部，其對無線通道的 強度進行檢測；以及框檢測部，其對上述框同步圖案進杆 檢測；當於上述訊號強度檢測部檢測出規定強度以上的气 201145931, 號強度後，直至經過規定時間為止的期間，未檢測出上述 框同步圖案的情況下，亦可再次開始進行無線通道的掃描。 據此’於未檢測出框同步圖案的情況下再次進行無線 訊號的檢測，故而可避免因不正確的無線訊號而導致無法 接收其他正常的無線訊號的事態。 通道的掃描 又，上述接收器包括對無線通道的訊號強度進行檢測 的訊號強度檢測部，於上述資料接收部接收上述資料時， 當訊號強度制部檢測出的訊號強度低於規定的強度的情 況下’亦可情無線喊的接收，並且再次開始進行無^ 據此，於無線訊號的接收中，若訊號強度變弱，則中 斷接收，並且再次進行無線訊號的檢測，故而可避免 1確的無線訊號而導致無法接收其他正常的無線訊號的事 態0 為讓本發明之上述特徵和優點能更明顯易懂， 舉實施例，並配合所附圖式作詳細說明如下。 、 本發明的目的及特徵可透過參照如下_ 佳實施例的說明而更明確。 的較 【實施方式】 以下，參照構成本說明書的一部分崎附圖式 細地說明本發明的實施㈣。在全部圖式中，對相同或類 似的部分標註相同的參照符號並省略說明。 <實施形態1> 以下，根據圖i及圖2之⑷、⑻、（e)來說明本 201145931 J mzpif 發明的實施形態1。 如圖1所示，本實施形態1的無線通訊系統具備一台 接收器10及多台發送器20。再者，於本實施形態中，對 連接有發送器20a〜20d、20x〜22z的共計7台而形成的發 送器20進行說明，但並不限定於此。 發送器20a…20d與接收器10 一併構成對講門鈐系 統。各發送器20a··.20d是根據來訪者的操作而發送呼出訊 號的對講門鈐子器，例如是包含相機等且發送人體檢測訊 號的人體檢測感測器，或者是安裝於玄關等的門上且發送 鑰匙的開閉訊號的鎖等。又，發送器2(b^..2〇z與接收器 1〇 —併構成照明控制系統。各發送器2〇χ…20z ^根據使 用者的操作而發送調光訊號的遙控裝置、是用來輸出表示 光，的點亮狀態的點亮訊號的照明器具、歧絲輸出表 不安裝於翻©等處的到區域的亮度㈣度檢測訊號的 照度感測器等。 各發送器20分別具備例如包含特定小電力無線電台 的發送部21 ’且將包含與各發❹2()的_或所屬系統 的類別相觸資訊的無線訊號發送至接收㈣。發送部21 自》又置於特疋頻帶内的多個無線通道中擇—選擇特定的益 線通道而將域訊餅送至接收器1G。再者，於本實施形 態中，分別選擇Chl、ch2...ch7作為各發送器咖…观、 20x…20z所使用的無線通道。 接收益10兼用作對講門鈴系統與照明控制系統的兩 個系統中的控制母機’且具備：例如包含微電腦等的控制 11 201145931 5 /J4zpir 部u'例如包含特定小電力無線電台的接收部12、以 含非揮發性半導體記憶體的記憶部13。 ”接收部12是根據控制部11的控制而動作，於指定掃 描對象的無線通道後，根據例如腿，由訊 以測定^由控制部Μ指定的無線通道的訊號強度2 將該測疋、纟。果輸出至控制部i卜而且，接收部是於藉 =制部11、而指定接㈣象的無線通道後，接收流動於户; 心疋的無線通勒的無線訊號，並將所接⑽無線訊號中 所包含的各種控制資訊等輸出至控制部11。 s己憶部13中儲存有藉由控制部11而記錄的資訊，此 處^己憶著由接收部12的訊號強度檢測部12a對掃描對象 的每一無線通道而測定的訊號強度。 —控制部11藉由内置的計時器（timer)(未圖示）而於 每一掃描週期啟動接收部12，以測定掃描對象的無線通道 的訊號強度’並根據各無線通道的訊號強度而控制接收部 12’以便接收自任一發送器2〇所發送的無線訊號。於本實 施形態中’以例如2 ms為單位而對各無線通道測定訊號強 度來進行測定’將測定所有無線通道（Chi〜Cli7)的訊號 強度所需要的掃描週期的1個週期量的時間設定為 14 ms (參照圖2之（b))。 發送器20發送至接收器1〇的無線訊號是採用如圖2 之（a)所示的格式(f〇rmat)，由前文pA、獨特字碼UW、 目的地位址DA、發送源位址SA、訊息MG、以及錯誤檢 測碼CR而構成〇前文pA是包含例如使〇與1交替地反覆 12 ⑤ 201145931 末位元設定為Ί 70列，例如將前導位元設定為0，最 .g^,,ox 7 ，於接收該位元列的期間，接收器可進行 =二:特字碼uw包含與前文PA不同的位元，於 ΠΛ ，被設定為例如32位元的長度。目的地位址 疋以識別成為無線訊號的目的地的接收器1〇的位元 I送源位址SA是用以唯一識別發送無線訊號的發送 时的位元歹J又，訊息是包含發送器2〇進行發送 的發送資訊的位元列，可根據要發送的發送#訊的内容而 使位兀ίΐ可變。錯誤檢測碼CR例如是包含CRC的位元 列’被設定為在進行訊號收發時至少可檢測出於構成訊息 MG的位元列中位元反轉等的異常。 、此處對接收器1〇接收無線訊號時的動作進行說明。 首先，接收器10的控制部U於每一掃描週期啟動接收部 12’使用接收部12而測定掃描對象的所有無線通道中的訊 號強度。測定所得的測定結果藉由控制部u而依序記憶於 圮憶部13中。各無線通道中的訊號強度例如成為如圖2 之（c)所示的結果，於以下說明申，是將ch4的訊號強 度設為最大且按照Ch2、Chi、Ch5、Ch3、Ch6、Ch7的順 序而使訊號強度逐漸變小而進行說明。再者，chl〜5的訊 號強度大於接收部12中判斷為有效的訊號強度的臨限值 th ’ Ch6、7的訊號強度小於臨限值也。 其次，控制部11將訊號強度最大的無線通道（此處 為Ch4)的無線訊號作為接收對象的無線通道，對接收部 12指定無線通道’使接收部12開始進行無線訊號的接收。 13 201145931 將接收部12固定於接㈣象的無線通道，進行與前文 PA、獨特字碼UW、目的地位址Da、發送源位址sa、訊 息MG、以及錯誤檢測碼（^相對應的位元圖案的檢測。 而且，若接收部12正確地檢測出各位元圖案，且無基於錯 誤檢測碼的訊號資訊的異常’進而若目的地位址da中包 含目的地自身作為發送對象，則判斷為有效的無線訊號， 接收部12將儲存於訊息MG中的資訊輸出至控制部u。 藉此，可由接收器10正確地接收流動於訊號強度最大的無 線通道中的無線訊號。 另一方面，當於接收部12中自接收對象的無線通道 無法正常地進行各位元圖案的檢測的情況，或者目的地位 址DA中不包含目的地自身的情況下，控制部u使接收部 12對於該無線通道中的無線訊號的接收中斷。其後，控制 Π自§己憶於§己憶部13中的每一無線通道的訊號強度 中’將訊號強度第2大的無線通道（此處為ch2)作為接 收對象的無線通道而對接收部12進行指定，使接收部12 開始進行無線訊號的接收。 控制部11於直至可藉由接收部12接收有效的無線訊 號並取得接收訊號中所包含的訊息MG為止，自訊號強度 第3 (Chi)大、第4 (Ch5)大…的無線通道依序反覆執 行上述接收動作《但是，當作為接收對象的無線通道的訊 號強度為小於臨限值th的訊號強度的情況下，不進行以後 的無線通道中的訊號接收，而是再次於每一規定的掃描週 期開始進行訊號強度的測定。即，於圖2之（c)所示的訊 201145931 J / J*tzpxf 號強度的情況下，嘗試無線訊號的接收，直至按照Ch4、 Ch2、Chi、Ch5、Ch3的順序接收有效的無線訊號為止。 又，即便嘗試接收Ch3中的無線訊號，但只要無法接收有 效的無線訊號，則會再次於每一掃描週期開始進行訊號強 度的測定。 如此，由於會優先進行訊號強度較大的無線通道中的 訊號接收’故而開始進行因功率的汽漏而使訊號強度超過 臨限值Λ的無線通道中的訊號接收，從而可減少發送器所 發送的無線通道中的無線訊號被忽略的情況。 又’自訊號強度較大的無線通道開始直至可依序接收 無線訊號為止進行接收處理，由此即使於訊號強度較大的 無線訊號的目的地位址中不包含目的地自身的情況下，亦 可接收流動於其他通道中的無線訊號。藉此’即使將不同 的無線通訊系統予以接近配置的情況下’亦可藉由分別收 發的無線訊號而減少目的地位址中包含目的地自身的無線 讯號被忽略的情況，從而可提高通訊效率。 再者’當無法正常地進行各位元圖案的檢測的情況 下j或目的地位址DA中不包含目的地自身的情況下’接 收°卩12亦可再次進行訊號強度的測定，並將訊號強度次強 =線通道作為接收對象。如此’可始終根據最新的訊號 =而接收無線訊號’可降低新發送的無線訊號被忽略的 可能性。 <實施形態2> 以下，根據圖3〜圖5來說明本發明的實施形態2。 15 201145931 如圖3所示，本實施形態2的無線通訊系統中，接收 器10更具備包含液晶面板及開關等的操作輸入部14。以 下，以與實施形態1不同的部分為中心而進行說明。 接收部12是根據控制部11的控制而動作，於指定掃 描對象的無線通道後，例如根據RSSI，由訊號強度檢測部 12a測定該無線通道中的訊號強度。當測定出的訊號強度 尚於規定的臨限值時，接收流動於該無線通道中的無線訊 號並輸出至控制部11，但當上述訊號強度低於規定的臨限 值時，不進行無線訊號的接收而是等待，直至再次由控制 部11指定無線通道為止。 記憶部13中儲存有藉由控制部u而記錄的資訊，於 本實施形態2中，記憶著例如各發送器2〇的優先度、識別 用的位址、以及無線通道的編號等資訊。再者，於本實施 形態中，下述操作輸入部14具有通道設定機構14a及優先 度設定部14b ’根據操作輸入部14的操作輸入而記憶著例 如圖5所示的設定資訊。例如，對於發送器2〇a，將識別 用位址设疋為001 ’將無線通道設定為chi，以及將優先度 设疋為「2」’對於發送器2〇b...20d、20χ··.20ζ亦進行相同 的設定。再者，關於優先度，例如隨著數字變小而使優先 度變高’將「1」設為優先度最高。 操作輸入部14是根據使用者的輸入操作而將操作輸 入訊號輸出至控制部11。使用者可根據操作輸入部14所 具有的液晶面板等上所顯示的文字、圖形等，而對操作輸 入部14所具有的開關等進行操作，對各發送器2〇中的識According to this, for example, in a single scanning cycle, the period of the wireless signal in which the higher priority channel is detected is longer, and thus the possibility that the wireless signal from the transmitter having the higher priority is detected is further improved. . In the above-mentioned wireless signal, a frame synchronization pattern including a pattern different from the above-described bit synchronization pattern is arranged in the above-described bit synchronization map, and the reception H includes: a degree of detection unit, the intensity of the wireless channel And detecting, wherein the frame detecting unit detects the frame synchronization pattern; and when the signal intensity detecting unit detects the gas 201145931 having a predetermined intensity or more, the number is not detected until a predetermined time elapses; In the case of the frame sync pattern, the scanning of the wireless channel can also be started again. According to this, when the frame sync pattern is not detected, the wireless signal is detected again, so that it is possible to avoid the situation in which other normal wireless signals cannot be received due to an incorrect wireless signal. Scanning of the channel, the receiver includes a signal strength detecting unit that detects a signal strength of the wireless channel, and when the data receiving unit receives the data, when the signal strength detected by the signal strength unit is lower than a predetermined intensity Under the 'received wireless shouting reception, and start again no. According to this, in the reception of the wireless signal, if the signal strength is weak, the reception is interrupted, and the wireless signal is detected again, so that it can be avoided. The above-described features and advantages of the present invention will become more apparent from the following description of the present invention. The objects and features of the present invention will become more apparent from the following description of the preferred embodiments. [Embodiment] Hereinafter, the implementation (4) of the present invention will be described in detail with reference to a part of the specification that constitutes the specification. In the drawings, the same or similar components are denoted by the same reference numerals, and the description is omitted. <Embodiment 1> Hereinafter, Embodiment 1 of the 201145931 J mzpif invention will be described based on (4), (8), and (e) of Figs. 2 and 2 . As shown in Fig. 1, the wireless communication system according to the first embodiment includes a single receiver 10 and a plurality of transmitters 20. In the present embodiment, the transmitter 20 formed by connecting a total of seven transmitters 20a to 20d and 20x to 22z is described, but the present invention is not limited thereto. The transmitters 20a...20d together with the receiver 10 form an intercom threshold system. Each of the transmitters 20a··.20d is an intercom gate device that transmits an outgoing call signal according to the operation of the visitor, and is, for example, a human body detection sensor that includes a camera or the like and transmits a human body detection signal, or is installed on a porch or the like. The lock on the door and the key to open and close the signal. Moreover, the transmitter 2 (b^..2〇z and the receiver 1〇) constitutes a lighting control system. Each of the transmitters 2〇χ20z^ transmits a dimming signal according to the user's operation, and is used for remote control. The illuminance sensor that outputs a lighting signal indicating the lighting state of the light, and the illuminance sensor of the illuminating signal output table that is not attached to the area (4) of the detection signal, etc., each of the transmitters 20 is provided. For example, the transmitting unit 21' including the specific small power radio station transmits a wireless signal including the information of the type of each of the hairpins 2() or the category of the belonging system to the receiving (4). The transmitting unit 21 is again placed in the special frequency band. Among the plurality of wireless channels, a specific benefit line channel is selected and the domain cake is sent to the receiver 1G. Further, in the present embodiment, Chl, ch2, ..., ch7 are selected as the respective transmitters... The wireless channel used by the view, 20x...20z. Receiver 10 is also used as the control master in the two systems of the intercom doorbell system and the lighting control system' and has: for example, a control including a microcomputer, etc. 11 201145931 5 / J4zpir part u' Contains specific small power without The receiving unit 12 of the radio station is a memory unit 13 including a non-volatile semiconductor memory. The receiving unit 12 operates under the control of the control unit 11, and after specifying the wireless channel to be scanned, the signal is determined based on, for example, a leg. ^ The signal strength 2 of the wireless channel designated by the control unit 将该 outputs the measured value to the control unit ib, and the receiving unit is configured to receive the (four) image of the wireless channel after receiving the signal. The wireless signal of the wireless wireless channel is transmitted to the control unit 11. The control information is stored in the control unit 11 by the control unit 11. The information here has been recalled by the signal strength detecting unit 12a of the receiving unit 12 for the signal strength measured for each wireless channel of the scanning target. The control unit 11 has a built-in timer (not shown). And the receiving unit 12 is activated in each scanning period to measure the signal strength of the wireless channel of the scanning target and control the receiving unit 12' according to the signal strength of each wireless channel to receive the wireless information transmitted from any of the transmitters 2 In the present embodiment, 'the signal strength is measured for each wireless channel in units of, for example, 2 ms, and one cycle amount of the scanning period required to measure the signal strength of all the wireless channels (Chi to Cli7) is measured. The time is set to 14 ms (refer to (b) of Fig. 2). The wireless signal sent by the transmitter 20 to the receiver 1 is in the format shown in (a) of Fig. 2 (f〇rmat), from the previous pA, The unique character UW, the destination address DA, the transmission source address SA, the message MG, and the error detection code CR constitute the p 文 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 For example, the preamble bit is set to 0, the most .g^, ox 7 , and during the period of receiving the bit column, the receiver can perform = two: the special word code uw contains a different bit from the previous PA, Set to a length of, for example, 32 bits. The destination address is used to identify the bit I of the receiver that is the destination of the wireless signal. The source address address SA is used to uniquely identify the bit 歹J at the time of transmission of the transmitted wireless signal, and the message includes the transmitter 2 The bit column of the transmission information to be transmitted may be made variable according to the content of the transmission message to be transmitted. The error detection code CR is, for example, a bit sequence CRC including CRC, which is set to detect at least an abnormality such as bit inversion in the bit column constituting the message MG when the signal is transmitted and received. Here, the operation when the receiver 1 receives the wireless signal will be described. First, the control unit U of the receiver 10 activates the receiving unit 12' for measuring the signal strength in all the wireless channels to be scanned by the receiving unit 12 every scanning period. The measurement results obtained by the measurement are sequentially stored in the memory unit 13 by the control unit u. The signal strength in each wireless channel becomes, for example, the result shown in FIG. 2(c). In the following description, the signal strength of ch4 is set to the maximum and in the order of Ch2, Chi, Ch5, Ch3, Ch6, and Ch7. The signal intensity is gradually reduced to explain. Further, the signal strengths of chl to 5 are larger than the thresholds of the signal strengths judged to be valid in the receiving unit 12, th' Ch6, and the signal strength of 7 is less than the threshold value. Next, the control unit 11 sets the wireless channel of the wireless channel (here, Ch4) having the highest signal strength as the wireless channel to be received, and specifies the wireless channel to the receiving unit 12 to cause the receiving unit 12 to start receiving the wireless signal. 13 201145931 The receiving unit 12 is fixed to the wireless channel of the (four) image, and performs a bit pattern corresponding to the foregoing PA, the unique word UW, the destination address Da, the transmission source address sa, the message MG, and the error detection code (^). Further, if the receiving unit 12 correctly detects the bit pattern and there is no abnormality of the signal information based on the error detecting code, and if the destination address da includes the destination itself as the transmission target, it is determined to be valid wireless. The receiving unit 12 outputs the information stored in the message MG to the control unit u. Thereby, the wireless signal flowing in the wireless channel having the highest signal strength can be correctly received by the receiver 10. On the other hand, in the receiving unit In the case where the wireless channel of the receiving target cannot detect the element pattern normally, or the destination address DA does not include the destination itself, the control unit u causes the receiving unit 12 to wirelessly signal the wireless channel in the wireless channel. The reception is interrupted. Thereafter, the control 忆 has recalled the signal strength of each wireless channel in § 忆 部 13 '' The line channel (here, ch2) designates the receiving unit 12 as the wireless channel to be received, and causes the receiving unit 12 to start receiving the wireless signal. The control unit 11 can receive the valid wireless signal by the receiving unit 12 and Until the message MG included in the received signal is obtained, the wireless channel from the signal strength 3 (Chi) and 4 (Ch5) is repeatedly executed in the above-described receiving operation "However, the signal of the wireless channel to be received" When the intensity is less than the signal strength of the threshold th, the signal reception in the subsequent wireless channel is not performed, but the measurement of the signal strength is started again for each predetermined scanning period. That is, in FIG. 2 (c) In the case of the strength of the 201145931 J / J*tzpxf number shown, try to receive the wireless signal until the valid wireless signal is received in the order of Ch4, Ch2, Chi, Ch5, Ch3. Also, even if you try to receive Ch3 The wireless signal, but as long as the valid wireless signal cannot be received, the signal strength is measured again at each scanning cycle. The signal receiving in the wireless channel with strong signal strength starts to perform signal reception in the wireless channel whose signal strength exceeds the threshold due to the steam leakage of the power, thereby reducing the wireless in the wireless channel transmitted by the transmitter. The signal is ignored. In addition, the wireless channel with a strong signal strength starts to receive the wireless signal in sequence, so that the destination address of the wireless signal with a large signal strength does not include the destination itself. In this case, it is also possible to receive wireless signals flowing in other channels, thereby reducing the purpose of the destination address by separately transmitting and receiving wireless signals even if different wireless communication systems are disposed close to each other. The ground's own wireless signal is ignored, which can improve communication efficiency. Furthermore, in the case where the detection of the meta-patterns cannot be performed normally, if the destination itself is not included in the j or the destination address DA, the reception of the signal can be performed again, and the signal strength can be measured again. Strong = line channel as the receiving object. Such a 'can always receive a wireless signal based on the latest signal =' can reduce the possibility that the newly transmitted wireless signal is ignored. <Embodiment 2> Hereinafter, Embodiment 2 of the present invention will be described with reference to Figs. 3 to 5 . 15 201145931 As shown in Fig. 3, in the wireless communication system according to the second embodiment, the receiver 10 further includes an operation input unit 14 including a liquid crystal panel, a switch, and the like. Hereinafter, a description will be given focusing on a portion different from the first embodiment. The receiving unit 12 operates under the control of the control unit 11, and after specifying the wireless channel to be scanned, the signal strength detecting unit 12a measures the signal strength in the wireless channel based on, for example, the RSSI. When the measured signal strength is still at a predetermined threshold, the wireless signal flowing in the wireless channel is received and output to the control unit 11, but when the signal strength is lower than the predetermined threshold, the wireless signal is not performed. The reception is waited until the wireless channel is designated again by the control unit 11. The information recorded by the control unit u is stored in the storage unit 13. In the second embodiment, information such as the priority of each transmitter 2, the address for identification, and the number of the wireless channel are stored. Further, in the present embodiment, the operation input unit 14 described below has the channel setting means 14a and the priority setting unit 14b' which store the setting information as shown in Fig. 5 in accordance with the operation input of the operation input unit 14. For example, for the transmitter 2a, set the identification address to 001', set the wireless channel to chi, and set the priority to "2" for the transmitters 2〇b...20d, 20χ· · The same setting is also made for .20ζ. Further, regarding the priority, for example, as the number becomes smaller, the priority becomes higher. "1" is set to have the highest priority. The operation input unit 14 outputs an operation input signal to the control unit 11 in accordance with an input operation by the user. The user can operate the switch or the like of the operation input unit 14 based on characters, figures, and the like displayed on the liquid crystal panel or the like of the operation input unit 14, and the knowledge in each of the transmitters 2
201145931, ^ /JHzpiI 別用的位址、優先度、無線通道的編號、以及發送器 的總數進行追加、變更、刪除等的設定變更。再者，於 作輸入部；U +使用者所進行的設定資訊是經由控制部^ 而被記憶於記憶部13中，控制部11根據記錄於記憶 中的貧訊而進行動作。 此處，發送器20發送至接收器10中的無線訊號是採 用如圖4之（a)所示的格式，且由前文pA、獨 資料DA、以及錯誤檢測碼CR而構成。前文pA是包含例 如使〇與1交替地反覆的位元同步圖案的位元列將 =定為〇 ’將最末位元設定為1 ’只有當該位元列為連 :、貝的64位减上的情況下，可將該位元列視為前文pA。 獨特字碼UW(框同步圖案）包含與前文伙不同的位 於本實施形態中，被設定為32位元的長度。資料da是包 含所發送的發送器20的識別用位址、以及 =的發送資訊的位_，且可根據要發送的發送資^ 内谷而使位元長度可變。錯誤檢測碼⑶例如是包含crc =二列，被設定為在進行訊號收發時至少可檢測出於構 成資料DA的位元列中位元反轉等的異常。 —控制部11藉由内置的計時器（未圖示）而以每一規 =時間掃描週期）啟動接收部12，對預先設定的 :、線通道依序進行掃描，並接收自任—發送器如發送的益 於本實施形態中，如圖4之㈦所示，根據記憶 13中的設定資訊，而對各無線通道以2 ms為單 進仃掃描。此時，由於將對發送器2〇χ〜2〇ζ甲所設定的 17 201145931 ^ «νγ«丄 無線通道ch5〜Ch7的優先度設定為「丨」，故而設定為於每 1週期的期間進行2次掃描，將發送器2〇a〜2〇d的優先度 設定為「2」，因此成為於每1週期的期間進行丨次掃描^ 對所有無線通道進行掃描所需要的掃描週期的丨個週^量 的時間成為20 ms。 作為具體的各無線通道的掃描方法，控制部u對接 收部12進行控制，使訊號強度檢測部12a檢測規定的益線 通道中的訊號強度，只要該檢測出的訊號強度充分，則將 無線訊號自接收部12輸入至控制部丨丨。接著，控制部u 藉由同步位元檢測部11a而對自接收部12輸入的=線°訊號 進行上述的位元同步圖案的檢測。於各無線通道中，當於 2 m s的期間未檢測出位元同步圖案的情況下，將掃描二象 的無線通道切換為下一無線通道，並再次進行位元同步圖 案的檢測。又，當於2 ms的期間檢測出位元同步圖案的情 況下’將掃描對象的無線通道固定為該無線通道，並繼續 規定的時間後，藉由框檢測部11b而進行獨特字碼17^的 檢測。於本實施形態中，作為進行檢測的規定的時間，設 疋為自位元同步圖案的檢測開始起算的4〇 ms，該時間是 將下述的時間相加後的時間，即，對所有無線通道進行掃 描所需要的1個週期量的時間20 ms、與判斷位元列為前 文PA所需要的64位元相對應的13.3 ms、以及與獨特字 碼UW的位元長度32位元相對應的6.7 ms。 其次，當未檢測出獨特字碼UW的情況下，接收器10 中止該無線通道中的無線訊號的接收，並再次開始進行各 201145931 •J / 無線通道的掃描。另一方面，當檢測出獨特字碼uw的情 況:，由資料接收部12b繼續進行資料DA的接收，並由 ，祆修正碼CR確認有無訊號資訊的異常，若無異常則取 得儲存於無線訊號中的資訊。再者，接收部12於接收有資 料DA時亦會定期檢測訊號強度，當訊號強度低於規定的 臨限值的情況下，將表示訊號強度降低的減輸出至控制 部U，根據來自控制部11的動作控制而結束該無線通道 的無線訊號的接收’並開始進行下—無線通道中的無線訊 號的掃描。 如此，接收器10於每一規定的掃描週期（20ms)通 過各無線通道而進行包含前文PA的無線訊號的接收。 此處，刖文PA的位元長度是設定為將與接收器中 的掃描週期（20 ms)相當的96位元、及前文pA的檢測 所需要的64位元相加後的16G位元。藉由如此設定，而於 自前文PA的前導位元起的96位元的期間，接㈣1〇檢 測出位元同步圖案的可能性變高，進而於其後，至少接續 有前文PA的檢測所需要的64位元的位元同步圖案，故而 接收器10可檢測出前文PA並進行無線訊號的接收。藉 此’由於發送器20發送的無線訊號藉由接收器1〇而接收 的概率提高，故而發送器20再次發送相同無線訊號的必要 性變低，從而可減少收發訊號所需要的時間。 再者如圖4之（c)所示，亦可使接枚器1〇對優先 度較高的無線通道ch5〜ch7的掃描時間較對優先度較低 的無線通道也1〜ch4的掃描時間更長，例如對比丨〜也4 201145931 ms 的掃描時間為2 ms ’對ch5〜ch7的掃福時門為* 又，於本實施形態中，各發送器2〇的^ 的 長度是設為160位元的峡長度，但亦可於各發送器 中設有設錢構，並根據接收器1G中所設定的（線通 數量、及進行各無線通道的掃描的！個週期的長度而進 變更’作為該變更機構’亦可於使用者經由操作輸入部14 而對接收器10的設定進行變更之後，發送由接收器1〇 發送器2G指示前文長度用的指示訊號，並根據發送器2〇 接受到的指示訊號而變更自身發送的無線訊號的前文長 度。 又，於本實施形態中，已對使本無線通訊系統適應對 講門鈴系統及照明控制系統的示例進行了說明，作其並不 限制可適應的系統，其可適應遠程診察系統等的各種系 統。例如，本發明適用於由設置於遠程地點的電力錶 (meter)、煤氣錶、自來水錶等的測量器自動進行測量並將 該測量結果作為遠程檢查資訊而進行授受的遠程檢查系 統。又，本發明亦可適用於火災報警系統。 以上，說明了本發明的較佳實施形態，但本發明並不 限定於該些特定的實施形態，可不超過後續的申請專利範 圍的範疇而進行多種變更及修正，這當然此亦屬於本發明 的範嘴。 雖然本發明已以貫施例揭露如上，然其並非用以限定 本發明，任何所屬技術領域中具有通常知識者，在不脫離 本發明之精神和範圍内，當可作些許之更動與潤飾，故本 20 201145931 發明之保護範圍當視後附之申请專利範圍所界定者為準 【圖式簡單說明】 ~ ° 圖1是表示本發明實施形態1的無線通訊系統的概略 方塊圖。 圖2之（a)是表示實施形態1的無線通訊系統的無 線訊號的格式的概略圖，圖2之（b )是用以說明對實施带 態1的無線訊號進行掃描時的時間分割方法的概略圖，圖 2之（c)是表示實施形態1的無線訊號的訊號強度的測定 結果的一例的圖表。 圖3是表示實施形態2的無線通訊系統的構成的概略 方塊圖。 圖4之（a)是表示實施形態2的無線通訊系統的無 線訊號的格式的概略圖，圖4之（b)、（c)是表示對實施 形態2的無線訊號進行掃描的時間的概略圖。 圖5是表示實施形態2的無線通訊系統的接收器中所 設定的設定内容的表。 【主要元件符號說明】 10 :接收器 11 :控制部 11a :同步位元檢測部 lib :框檢測部 12 :接收部 12a :訊號強度檢測部 12b :資料接收部 21 201145931 13 :記憶部 14 :操作輸入部 14a :通道設定機構 14b :優先度設定部 20a :發送器 20b :發送器 20c :發送器 20d :發送器 20x :發送器 20y :發送器 20z :發送器 21 :發送部 ⑧201145931, ^ /JHzpiI Change the setting of the address, priority, number of the wireless channel, and the total number of transmitters, such as addition, change, and deletion. Further, as the input unit, the setting information by the U + user is stored in the storage unit 13 via the control unit, and the control unit 11 operates based on the poor memory recorded in the memory. Here, the wireless signal transmitted from the transmitter 20 to the receiver 10 is in the format shown in (a) of Fig. 4, and is composed of the foregoing pA, the unique data DA, and the error detection code CR. The foregoing pA is a bit column including, for example, a bit synchronization pattern in which 〇 and 1 are alternately repeated, and is set to 〇 'the last bit is set to 1 ' only when the bit column is connected: In the case of a decrease, the bit column can be regarded as the previous pA. The unique character UW (frame sync pattern) includes a bit different from the previous character in the present embodiment, and is set to a length of 32 bits. The data da is a bit__ containing the transmitted address of the transmitted transmitter 20 and the transmitted information of =, and the bit length can be made variable according to the transmission medium to be transmitted. The error detection code (3) includes, for example, crc = two columns, and is set to detect at least an abnormality such as bit inversion in the bit column constituting the material DA when the signal is transmitted and received. - The control unit 11 activates the receiving unit 12 by a built-in timer (not shown) for each gauge = time scan period, sequentially scans the preset: line channels, and receives the slave-transmitter as In the present embodiment, as shown in (7) of FIG. 4, according to the setting information in the memory 13, each wireless channel is scanned for 2 ms. At this time, since the priority of the 17 201145931 ^ «νγ«丄 wireless channels ch5 to Ch7 set to the transmitter 2〇χ2 is set to "丨", it is set to be performed every period of the cycle. In the second scan, the priority of the transmitters 2〇a to 2〇d is set to "2", so that one scan is performed every one cycle, and one scan cycle required for scanning all the wireless channels is performed. The time of the week is 20 ms. As a specific scanning method for each wireless channel, the control unit u controls the receiving unit 12 to cause the signal strength detecting unit 12a to detect the signal strength in the predetermined benefit channel, and if the detected signal strength is sufficient, the wireless signal is transmitted. The input unit 12 is input to the control unit 丨丨. Next, the control unit u performs the above-described bit synchronization pattern detection on the = line ° signal input from the receiving unit 12 by the sync bit detecting unit 11a. In each wireless channel, when the bit synchronization pattern is not detected during 2 m s, the wireless channel scanning the two images is switched to the next wireless channel, and the detection of the bit synchronization pattern is performed again. Further, when the bit synchronization pattern is detected for a period of 2 ms, 'the wireless channel of the scanning target is fixed to the wireless channel, and after the predetermined time elapses, the unique character code 17 is performed by the frame detecting portion 11b. Detection. In the present embodiment, the predetermined time period for detecting is set to 4 〇 ms from the start of detection of the bit sync pattern, and the time is the time after adding the following time, that is, for all wireless The time period of one cycle required for the channel to scan is 20 ms, 13.3 ms corresponding to the 64-bit element required for the judgment bit column to be listed in the foregoing PA, and the bit length corresponding to 32 bits of the unique word code UW. 6.7 ms. Secondly, when the unique word UW is not detected, the receiver 10 suspends the reception of the wireless signal in the wireless channel and starts the scanning of each 201145931 • J / wireless channel again. On the other hand, when the unique word uw is detected: the data receiving unit 12b continues to receive the data DA, and the 祆 correction code CR confirms whether or not there is an abnormality of the signal information, and if there is no abnormality, it is stored in the wireless signal. Information. Furthermore, the receiving unit 12 periodically detects the signal strength when receiving the data DA, and when the signal strength is lower than the predetermined threshold, outputs a reduction indicating the signal strength reduction to the control unit U, according to the control unit. The action control of 11 ends the reception of the wireless signal of the wireless channel' and starts the scanning of the wireless signal in the wireless channel. Thus, the receiver 10 performs reception of the wireless signal including the foregoing PA through each wireless channel every predetermined scanning period (20 ms). Here, the bit length of the message PA is set to be a 96-bit element which adds 96-bit elements corresponding to the scanning period (20 ms) in the receiver and 64-bit elements required for the detection of the previous pA. By setting in this way, the probability of detecting the bit synchronization pattern is increased in the period of 96 bits from the leading bit of the preceding PA, and thereafter, at least the detection station of the foregoing PA is succeeded. The required 64-bit bit synchronization pattern, so the receiver 10 can detect the previous PA and receive the wireless signal. By this, the probability that the wireless signal transmitted by the transmitter 20 is received by the receiver 1 is increased, so that the necessity of the transmitter 20 transmitting the same wireless signal again becomes lower, so that the time required for transmitting and receiving the signal can be reduced. Furthermore, as shown in (c) of FIG. 4, the scanning time of the wireless channel ch5 to ch7 with higher priority can also be made to the scanning time of the wireless channel having a lower priority than the wireless channel having a lower priority. Longer, for example, contrast 丨~ also 4 201145931 ms scan time is 2 ms 'The wipe time gate of ch5~ch7 is * again. In this embodiment, the length of each transmitter 2〇 is set to 160. The length of the gorge of the bit, but it is also possible to provide a money structure for each transmitter, and change according to the length of the line pass and the length of the ! cycle for scanning each wireless channel set in the receiver 1G. The "change mechanism" may be configured to transmit an instruction signal for indicating the length of the previous message by the receiver 1 〇 transmitter 2G after the user changes the setting of the receiver 10 via the operation input unit 14, and according to the transmitter 2 The length of the wireless signal transmitted by itself is changed by the received instruction signal. Further, in the present embodiment, an example in which the wireless communication system is adapted to the intercom doorbell system and the lighting control system has been described. Limit adaptable system It can be adapted to various systems such as a remote medical examination system, etc. For example, the present invention is applicable to automatic measurement by a measuring instrument of a power meter (meter), a gas meter, a water meter, and the like installed at a remote place, and the measurement result is used as a remote inspection. The present invention is also applicable to a fire alarm system. The preferred embodiment of the present invention has been described above, but the present invention is not limited to the specific embodiments and may not exceed the subsequent embodiments. Various changes and modifications may be made without departing from the scope of the invention. Generally, the knowledge of the invention can be changed and retouched without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the invention is based on the scope defined in the appended patent application. Fig. 1 is a schematic block diagram showing a wireless communication system according to Embodiment 1 of the present invention. (a) of Fig. 2 is a diagram showing FIG. 2(b) is a schematic diagram for explaining a time division method for scanning a wireless signal of the band state 1, and FIG. 2(c) is a schematic view showing a format of a wireless signal of the wireless communication system of the first embodiment. Fig. 3 is a schematic block diagram showing a configuration of a wireless communication system according to the second embodiment. Fig. 3 (a) is a schematic block diagram showing the configuration of the wireless communication system according to the second embodiment. FIG. 4 is a schematic diagram showing a time period in which the wireless signal of the second embodiment is scanned. FIG. 5 is a schematic diagram showing a wireless communication system according to the second embodiment. Table of setting contents set in the receiver. [Description of main component symbols] 10: Receiver 11: Control unit 11a: Synchronization bit detection unit lib: Frame detection unit 12: Reception unit 12a: Signal strength detection unit 12b: Data receiving unit 21 201145931 13 : Memory unit 14: Operation input unit 14a: Channel setting unit 14b: Priority setting unit 20a: Transmitter 20b: Transmitter 20c: Transmitter 20d: Transmitter 20x: Transmitter 20y: 20Z is: Transmitter 21: transmission unit ⑧